Synthesis of 3-Deoxynucleosides With 2-Oxabicyclo[3.1.0]hexane Sugar Moieties: Addition of Difluorocarbene to a 3,4-Unsaturated Uridine Derivative and 1,2-Dihydrofurans Derived From D- And L-Xylose1

doi 10.1021/jo062614d.s001